Research Direction of Pressure Transmitter
At present, the routine calibration of pressure transmitters is only to pass the atmosphere at its low pressure end, but in practice a certain static pressure often exists at both ports of the differential pressure transmitter. Under different static pressures, the measurement performance of the differential pressure transmitter may be significantly affected. Neglecting the effect of static pressure may cause bias and misjudgment of the calibration results. Therefore, the differential pressure compensation under static pressure is very important. An industrial differential pressure control equipment testing device is designed for the calibration of differential pressure transmitters under atmospheric and static pressure. A real-time compensation device for static pressure of differential pressure transmitter is designed to maximize the compensation of the error caused by static pressure and improve the accuracy of differential pressure measurement. The existing static pressure calibration only considers the calibration under atmospheric pressure, while the high static pressure calibration is not popular, and the existing high static pressure correction device is complicated to operate, resulting in the application of certain limitations. Therefore, a calibration device for differential pressure devices under high static pressure is designed. The device is simple to operate and easy to use, and at the same time avoids damage to the device due to excessive pressure at both ends of the differential pressure device.
The development trend of pressure transmitters
From the initial simple function type gradually evolved into today's intelligent type. From the overall trend, wireless, intelligent, high-precision will become the main development direction of pressure transmitters.
① Wireless
With the continuous development of wireless communication technology, the stability and rate of wireless transmission have been rapidly improved. This makes the advantages of wireless more and more significant. In the industrial field, there are usually wiring difficulties, difficult to reach personnel, strong electromagnetic interference, space complexity and other characteristics, especially in the oil and gas, chemical industry. The adoption of wireless high-precision pressure transmitters can significantly improve the informationization and digital management level of industrial field pressure measurement, and significantly reduce operation and maintenance costs. Wireless pressure transmitter will play an important role in the industrial field, has a broad application prospects.
② Intelligent
Sensors continue to develop and electronic technology continues to innovate. Sensors and microprocessors become more intelligent through the combination. Transmitter will have more rich functions, such as self-diagnosis, rich interface protocols. This intelligent trend makes the transmitter more flexible and reliable in the application of related fields. Intelligent transmitters with self-diagnostic functions upload fault and alarm information to the safety control system in real time, so that the control system can deal with the existing faults and risks in a timely manner, and improve the maintainability and stability of the system; rich interface protocols allow the transmitter to meet more application scenarios, which makes it easier for the transmitter to be integrated with other equipment and systems, and promotes the development of automation and intelligence in related industries.
③ High precision
With the continuous progress of material technology, more advanced materials can be used to manufacture sensitive elements of pressure sensors, such as silicon carbide, graphene and so on. These new materials can maintain excellent performance under various temperature conditions, thus significantly improving the application range and reliability of pressure transmitters. Meanwhile, with the development of MEMS technology, pressure transmitters will realize higher accuracy measurement.
Conclusion
As a kind of high-precision pressure measuring instrument, pressure transmitter has been widely used in the industrial field. This paper firstly introduces the main structure and common classification of pressure transmitter; then analyzes the current research status of pressure transmitter from the aspects of communication mode, high temperature extreme environment measurement, self-diagnostic function, temperature compensation method, etc.; finally, it gives an outlook on the possible development direction of pressure transmitter in the future-wireless, intelligent, and high-precision will become the main development direction of pressure transmitter in the future.
